tenacious

adjectives

good at remembering
"a retentive mind"; "tenacious memory"
long, recollective, retentive, tenacious
is derived from
tenaciousness
stubbornly unyielding
"dogged persistence"; "dour determination"; "the most vocal and pertinacious of all the critics"; "a mind not gifted to discover truth but tenacious to hold it"- T.S.Eliot; "men tenacious of opinion"
dogged, dour, persistent, pertinacious, tenacious, unyielding
is derived from
tenaciousness
is derived from
tenacity
sticking together
"two coherent sheets"; "tenacious burrs"
coherent, tenacious